The fungus that altered the course of history by reducing the population of Ireland from eight million in 1845 to six-million a decade later was:

Penicillium glucum

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Phytophthora

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Synchytrium

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Olpidium

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Solution

The correct option is B Phytophthora
The disease known as potato blight had destroyed potato crops on a massive scale in Ireland, resulting in the starvation of many people and emigration of many others to USA.

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Year	Total Population (in millions)	Absolute Increase in the Decade (in millions)	Annual Growth Rate (%)
1951 1961 1971 1981 1991 2001	361.0 439.2 548.2 683.3 846.4 1028.7	42.43 78.15 108.92 135.17 163.09 182.32	1.25 1.96 2.20 2.22 2.14 1.93

The native population of the Americans dropped from almost 57 million to 5 million. What was the single most important reason for this?

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